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Viagra is the first oral drug for male impotence. Viagra Sildenafil is a discreet pill for the treatment of male erectile dysfunction, often called impotence, ED or Erectile Dysfunction (also called sexual impotence). Sildenafil was synthesized by a team of pharmaceutical chemists working with Pfizer at the Kent research facility. Pfizer holds the worldwide patent on Sildenafil Citrate which is most likely to expire in 2011-2013, is a real breakthrough treatment that can help many man who have erectile dysfunction to get and keep an erection when they are sexually aroused.

Sildenafil Citrate (Generic Viagra) belongs to a group of medicines that delay the enzymes called phosphodiesterases, the penis is one of the areas where these phosphodiesterases enzymes work. Sildenafil Citrate, is a generic drug sold under various brand names such as Viagra, Revito and many other brands. This type of drug is popularly used to treat male erectile dysfunction and Pulmonary Arterial Hypertension (PAH). Viagra Sildenafil causes erections only during sexual excitement. Generic Viagra does not work in the absence of sexual arousal.

How does Generic Viagra work?

Viagra Sildenafil works by dilating blood vessels in the penis, allowing the inflow of blood needed for an erection. Sildenafil increases blood flow to the penis allowing more blood flow into the penis like happened naturally when a man is sexually stimulated With more blood flowing in and less flowing out, the arteries in the penis enlarge resulting in an erection. If this mechanism is not working properly a man has difficulties in having and keeping en erection. Using Sildenafil a man can respond to sexual stimulation during a sexual encounter and once it is over the erection goes away.